Average annual unimpaired flow in the Sacramento Valley (which is also average inflow to the Delta) is about 21.6 million acre-feet. Consumptive water rights claims are estimated to be 120.6 million acre-feet. In the Trinity River basin, average unimpaired flow is about 1.28 million acre-feet per year, and consumptive water rights claims come to about 8.725 million acre-feet.
The ratio of consumptive claims to unimpaired flow is about 6.80 in the Trinity basin, or about 6.8 acre-feet of claims for every acre-foot of unimpaired flow in an average year.
The ratio of total consumptive use claims to average unimpaired flow in the Sacramento River basin combined is about 5.58. That means that there are about 5.6 acre-feet of claims in water rights to every acre-foot of unimpaired flow in an average year.